Re: High CPU load, but nothing consuming it...
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On Thu, Feb 18, 2016 at 04:26:54PM +0100, Florent B wrote:
> Hi everyone,
>
> Today I have a little problem with a server on Jessie.
>
> It acts as a load balancer with IPVS+Keepalived.
>
> It is clustered with another server as failover, both servers have the
> same problem. Even if one of them is "slave", without charge.
>
> Sometime CPU load jump over 15 (1min average) and goes down to near zero
> a few minutes later. In the meantime, all CPU stats are "normal" (stable
> iowait, etc.).
You can run top in batch mode, around the interesting interval like
so:
top -d 10 -b > /tmp/top
(-d is the "display interval" in seconds. Choose a value with sufficient
resolution to "see" what's going on, but not as high as to fill up your
disk).
You can then correlate your top's time stamp with your load graphs
(top writes the current time in the header).
Season to taste :-)
regards
- -- t
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